US4583174A - Electronically controlled fuel injection apparatus for internal combustion engine - Google Patents

Electronically controlled fuel injection apparatus for internal combustion engine Download PDF

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Publication number
US4583174A
US4583174A US06/520,316 US52031683A US4583174A US 4583174 A US4583174 A US 4583174A US 52031683 A US52031683 A US 52031683A US 4583174 A US4583174 A US 4583174A
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Prior art keywords
engine
rate
fuel injection
pulse
internal combustion
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Expired - Fee Related
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US06/520,316
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English (en)
Inventor
Haruo Watanabe
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Toyota Motor Corp
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Toyota Motor Corp
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Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WATANABE, HARUO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F02D41/105—Introducing corrections for particular operating conditions for acceleration using asynchronous injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/16—Introducing closed-loop corrections for idling

Definitions

  • the present invention relates to an electronically controlled fuel injection apparatus for an internal combustion engine, and particularly to an apparatus for stabilizing the engine speed under idling condition.
  • a conventional electronically controlled fuel injection apparatus it is common to supply an amount of fuel injection which is proportional to the amount of suction air per excursion of the engine or the amount of suction air per excursion divided by an engine rotation speed.
  • an idling mode or constant velocity running mode In an idling mode or constant velocity running mode, however, a constant and stable engine output is required.
  • the engine output or the engine rotation speed changes due to external disturbances such as small change in a load or variance in a burning rate, and unstable idling state or surging takes place.
  • Such problems are serious particularly when a lean air-to-fuel ratio is set to reduce air pollusion by exhaust gas or exhaust gas recirculation control value (EGR) is used, or when a low idling rotation is set to save fuel consumption.
  • EGR exhaust gas recirculation control value
  • the amount of fuel injection is changed when the amount of suction air or the engine rotation speed changes to compensate for the change in the load or the rotation speed.
  • the compensation based on the amount of suction air or the engine rotation speed (at least one rotation) cannot completely compensate for the stability of the engine.
  • the present apparatus is invented in order to remove the above disadvantages in the prior art.
  • the object of the present invention is to provide an electronically controlled fuel injection apparatus for an internal combustion engine which is capable of keeping the engine speed constant under idling condition.
  • the apparatus increases the rate of fuel injection when the engine acceleration drops by a rate more than a predetermined rate under a condition that the aperture of the throttle valve is minimum, that is, under an idling condition.
  • the width of the basic fuel injection pulse is enlarged which is given according to the engine acceleration and the intake air flow rate, or, in addition to the basic fuel injection pulse, a predetermined quantity of fuel is injected asynchronously, i.e., independently from the crank angle of the engine.
  • the present invention has advantages that when the engine speed drops, for example, due to additional loads, the quantity of fuel injection is increased synchronously to or asynchronously from the crank angle so as to prevent the stall and surging of the engine. As a result, the engine speed is kept constant under idling condition.
  • FIG. 1 is a block diagram showing an embodiment of the present invention
  • FIGS. 2 and 3 are circuit diagrams showing the details of the above embodiment
  • FIG. 4 is a diagram showing wave forms in portions in the circuit shown in FIGS. 2 and 3,
  • FIG. 5 is a circuit diagram partially showing another embodiment
  • FIG. 6 is a chart for illustrating a change in the engine speed under idling condition of a four-cylinder engine to which the embodiment of FIG. 1 is applied.
  • FIG. 1 shows an analogue circuit diagram of one embodiment of the present invention.
  • numeral 1 denotes an engine and a rotating member 3 for indicating a crank position is fixed to a crank shaft 2.
  • a crank angle sensor 4 is displaced close to the rotating member 3.
  • the engine 1 is provided with an O 2 sensor 5 and a water temperature sensor 6, and an air flow meter 7 detects the amount of suction air to the engine 1.
  • Numeral 8 denotes a throttle valve and an injector 10 is mounted in a suction pipe 9.
  • Numeral 81 defines an idle switch which turns on when the aperture of the throttle valve is minimized under an idling condition.
  • a control unit for controlling the engine is designated by numeral 11.
  • the control circuit 11 includes a basic injection pulse generating circuit 13 for generating an injection pulse per engine revolution. Normally, an engine rotation signal 12 from a primary winding of an ignition coil is supplied to the basic injection pulse generating circuit 13.
  • the circuit 13 is connected to a pulse correction circuit 14 which is connected to an injector drive circuit 15 for driving an injector 10.
  • the injector drive circuit 15 supplies an injector drive signal 15A to the injector 10.
  • Applied to the pulse correction circuit 14 are, in addition to the signal from the basic injection pulse generating circuit 13, a water temperature sensor signal 6A from the water temperature sensor 6, an air-fuel ratio correction signal 16A supplied from the 0 2 sensor 5 through an air-fuel ratio feedback circuit 16.
  • a rotation acceleration signal 17A is generated by a rotation speed acceleration rate detection circuit 17 and applied to a rotation acceleration correction circuit 18.
  • This circuit corrects the signal 17A so as to generate a rotation acceleration correction signal 18A, which is fed through a analogue switch 26 to the circuit 14.
  • the switch 26 is turned on when the idle switch 81 is turned on.
  • the acceleration variation correction circuit 18 functions to calculate a correction amount based on a deviation of the rotation variation rate signal 17A supplied from the rotation speed acceleration rate detection circuit 17 from a predetermined value or on a predetermined function.
  • the rotation acceleration correction circuit 18 may produce another injection pulse signal 18B, in addition to the normal injection pulse signal, to the injector drive circuit 15 when an absolute value of a negative portion of the rotation acceleration rate signal 17A exceeds a predetermined level, to drive the injector 10. In this case, the engine rotation can be more stabilized.
  • the basic injection pulse generator 13 comprises: a JK-Flip-Flop (JK-FF) 130, an AND gate 131, one of input terminals of which is connected to the Q terminal of the JK-FF 130; and a first analogue switch 132 connected to the Q terminal of the JK-FF 130.
  • An end of the first analogue switch 132 is connected to a power source through V/I converter 133 to convert voltage into current.
  • the other end of the first analogue switch 132 is grounded through a capacitor 134 to determine the time period, for which current is supplied to the injector, connected to a positive input terminal of the comparator 136 through a resistor 135, and connected to an end of a second analogue switch 137.
  • the other end of the second analogue switch 137 is connected to an air flow meter 7 through an V/I converter 138.
  • An output terminal of the comparator 136 is connected to the other of the input terminals of the AND gate 131.
  • An output terminal of the AND gate 131 is connected to the second analogue switch 137 and also connected to the pulse correction circuit 14.
  • the air-fuel ratio feedback circuit 16 is a series circuit comprising a voltage follower consisting of an operational amplifier 161, resistor 162, comparator 163, and an integrator circuit including a resistor 164, a capacitor 165 and an operational amplifier 166. An output terminal of this integrator circuit is connected to the pulse correction circuit 14.
  • the pulse correction circuit 14 having an arrangement substantially similar to the basic injection pulse generator 13, includes: an AND gate 140; analogue switches 141 and 142; V/I converters 143 and 144; a capacitor 145; a resistor 146; and a comparator 147.
  • the V/I converter 144 is connected to the analogue switch 26 through a resistor 148 and a signal conversion circuit 149 for extending the discharging time of the capacitor 145 to thereby extend the fuel injection time, connected to the water temperature sensor 6 through a resistor 150 and a signal conversion circuit 151 similar to the above, and further connected to the air-fuel ratio feedback circuit 16 through a resistor 152 and a signal conversion circuit 153 similar to the above.
  • Numeral 156 denotes an AND gate.
  • the rotation speed acceleration rate detector 17 and the rotation speed acceleration correction circuit 18 are illustrated in detail in FIG. 3.
  • the rotation speed acceleration rate detector 17 consists of a monostable multivibrator 171 connected to the crank angle sensor 4, an integration circuit including an operational amplifier 172, resistor 173 and capacitor 174, and a differential circuit including resistors 175 and 177, capacitor 176 and operational amplifier 178.
  • the rotation speed acceleration correction circuit 18 consists of a diferential amplifier including an operational amplifier 181 and resistors 182 to 185.
  • the resistors 183 and 184 are provided for determining a negative reference voltage.
  • the crank angle sensor 4 feeds an engine speed signal to the monostable multivibrator, which devides the engine speed signal.
  • the divided engine speed signal is as a frequency signal fed to the integration circuit which converts the frequency signal into a voltage signal, that is, the integration circuit is a F/V convertor.
  • the voltage signal is fed to the diferential circuit which diferentiates the voltage signal so as to generate an engine speed acceleration rate signal as a voltage signal.
  • the engine speed acceleration rate signal is fed to the diferential amplifier in which the engine speed acceleration rate signal is compared with the negative reference voltage determined by the registors 183 and 184.
  • the diferential amplifier When the engine speed acceleration rate signal is negative and is greater in absolute value than the absolute value of the reference voltage, the diferential amplifier generates a correction signal with value in proportional to the deference between the absolute values of the engine speed acceleration rate signal and the reference voltage.
  • the engine rotation speed signal a has a waveform shown in FIG. 4.
  • the engine rotation speed signal a frequency-divided by the JK-FF 130 and produced as a signal P shown in FIG. 4.
  • the correction signal 18A is fed to the correction circuit 14 so that the width of the basic fuel injection pulse is enlarged and the rate of fuel injection is increased synchronously to the crank angle, when the engine speed decelarates at a rate more than a predetermined rate.
  • FIG. 5 partially shows a circuit diagram of the embodiment.
  • the arrangement omitted in FIG. 5 of the embodiment is same as the corresponding arrangement of FIG. 1.
  • the rotation acceleration correction circuit 18 consists of a diferential amplifier including operational amplifier 181 and resistors 183 and 184, and a monostable multivibrator 186 which may be, for example, SN74LS121.
  • the multivibrator includes a capacitor 187 and a resistor 188 for determining the width of output pulses.
  • the output terminal of the correction circuit 18 is connected to one input terminal on the AND circuit 28, the other input terminal of which is connected with the idle switch 81.
  • the output terminal of the AND circuit 28 is connected to the injection driver circuit 15.
  • the multivibrator 186 feeds a pulse with a predetermined width to the injection driver circuit 15 so as to cause the fuel injection independently from the basic fuel injection pulses, that is, asynchronously from the crank angle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US06/520,316 1980-04-14 1983-08-04 Electronically controlled fuel injection apparatus for internal combustion engine Expired - Fee Related US4583174A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4906380A JPS56146025A (en) 1980-04-14 1980-04-14 Electronic control device for engine
JP55-49063 1980-04-14

Related Parent Applications (1)

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US06252387 Continuation-In-Part 1981-04-09

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US4583174A true US4583174A (en) 1986-04-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700675A (en) * 1985-05-31 1987-10-20 Honda Giken Kogyo K.K. Method of controlling fuel supply for internal combustion engine at idle
US4706196A (en) * 1984-08-10 1987-11-10 Nippondenso Co., Ltd. Apparatus and method for injecting fuel into engine according to group injection system
US4872117A (en) * 1984-11-30 1989-10-03 Suzuki Jidosha Kogyo Kabushiki Kaisha Apparatus for controlling an air-fuel ratio in an internal combustion engine
US5050084A (en) * 1989-02-01 1991-09-17 Japan Electronic Control Systems Co., Ltd. Method and apparatus for controlling supply of fuel into internal combustion engine

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56146025A (en) * 1980-04-14 1981-11-13 Toyota Motor Corp Electronic control device for engine
JPS58131362A (ja) * 1982-01-29 1983-08-05 Nippon Denso Co Ltd エンジン回転速度制御方法
JPS58150035A (ja) * 1982-03-01 1983-09-06 Toyota Motor Corp 内燃機関の電子制御燃料噴射方法
JPS58174143A (ja) * 1982-04-07 1983-10-13 Nissan Motor Co Ltd 内燃機関の制御方法
DE3231766A1 (de) * 1982-08-26 1984-03-01 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum regeln der leerlaufdrehzahl bei einer brennkraftmaschine
DE3311550A1 (de) * 1983-03-30 1984-10-04 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur leerlaufdrehzahlregelung fuer brennkraftmaschinen
DE3437324A1 (de) * 1984-10-11 1986-04-24 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und vorrichtung zur regelung der leerlaufdrehzahl bei brennkraftmaschinen
JPS6193272A (ja) * 1984-10-12 1986-05-12 Nec Home Electronics Ltd 点火位相動的制御装置
US4570592A (en) * 1985-01-22 1986-02-18 Honda Giken Kogyo Kabushiki Kaisha Method of feedback-controlling idling speed of internal combustion engine
JPS63295868A (ja) * 1987-05-28 1988-12-02 Nippon Denso Co Ltd 内燃機関用点火時期制御装置
JPH0732939Y2 (ja) * 1988-06-09 1995-07-31 株式会社ユニシアジェックス 内燃機関の点火時期制御装置
JPH02102371A (ja) * 1988-10-12 1990-04-13 Japan Electron Control Syst Co Ltd 内燃機関の点火時期制御装置
JPH04340303A (ja) * 1991-05-14 1992-11-26 Hino Motors Ltd 車両用回転制御装置

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US3964457A (en) * 1974-06-14 1976-06-22 The Bendix Corporation Closed loop fast idle control system
US4047507A (en) * 1974-05-07 1977-09-13 Nippondenso Co., Ltd. Fuel economizing system
DE2727804A1 (de) * 1977-06-21 1979-01-18 Bosch Gmbh Robert Verfahren zum betrieb und einrichtung einer einspritzanlage bei brennkraftmaschinen
JPS5459509A (en) * 1977-10-19 1979-05-14 Hitachi Ltd Controller of idle r.p.m.
US4172433A (en) * 1974-12-05 1979-10-30 Robert Bosch Gmbh Process and apparatus for fuel-mixture preparation
US4181461A (en) * 1977-03-10 1980-01-01 Vibramec S.A.R.L. Apparatus for opening disposable packaging
US4244023A (en) * 1978-02-27 1981-01-06 The Bendix Corporation Microprocessor-based engine control system with acceleration enrichment control
US4245599A (en) * 1979-12-19 1981-01-20 General Motors Corporation Vehicle engine idle speed governor with unsymmetric correction rates
US4296722A (en) * 1978-07-26 1981-10-27 Hitachi, Ltd. Control apparatus for an internal combustion engine
JPS56146025A (en) * 1980-04-14 1981-11-13 Toyota Motor Corp Electronic control device for engine
US4306527A (en) * 1979-01-26 1981-12-22 Nippondenso Co., Ltd. Method and apparatus for controlling engine rotational speed
JPS5788242A (en) * 1980-11-21 1982-06-02 Nippon Denso Co Ltd Controlling method of internal combustion engine
US4344397A (en) * 1979-05-05 1982-08-17 Volkswagenwerk Aktiengesellschaft Method for operation of a spark-ignited internal combustion engine and arrangement for execution of the method
US4380979A (en) * 1978-12-06 1983-04-26 Nissan Motor Co., Ltd. Idling revolution control device for an internal combustion engine
US4385596A (en) * 1979-07-19 1983-05-31 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4440119A (en) * 1982-02-02 1984-04-03 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic fuel injecting method and device for internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047507A (en) * 1974-05-07 1977-09-13 Nippondenso Co., Ltd. Fuel economizing system
US3964457A (en) * 1974-06-14 1976-06-22 The Bendix Corporation Closed loop fast idle control system
US4172433A (en) * 1974-12-05 1979-10-30 Robert Bosch Gmbh Process and apparatus for fuel-mixture preparation
US4181461A (en) * 1977-03-10 1980-01-01 Vibramec S.A.R.L. Apparatus for opening disposable packaging
DE2727804A1 (de) * 1977-06-21 1979-01-18 Bosch Gmbh Robert Verfahren zum betrieb und einrichtung einer einspritzanlage bei brennkraftmaschinen
JPS5459509A (en) * 1977-10-19 1979-05-14 Hitachi Ltd Controller of idle r.p.m.
US4244023A (en) * 1978-02-27 1981-01-06 The Bendix Corporation Microprocessor-based engine control system with acceleration enrichment control
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US4344397A (en) * 1979-05-05 1982-08-17 Volkswagenwerk Aktiengesellschaft Method for operation of a spark-ignited internal combustion engine and arrangement for execution of the method
US4385596A (en) * 1979-07-19 1983-05-31 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4245599A (en) * 1979-12-19 1981-01-20 General Motors Corporation Vehicle engine idle speed governor with unsymmetric correction rates
JPS56146025A (en) * 1980-04-14 1981-11-13 Toyota Motor Corp Electronic control device for engine
JPS5788242A (en) * 1980-11-21 1982-06-02 Nippon Denso Co Ltd Controlling method of internal combustion engine
US4440119A (en) * 1982-02-02 1984-04-03 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic fuel injecting method and device for internal combustion engine

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Gorille et al.: Bosch Electronic Fuel Injection with Closed Loop Control, E paper #750368, (Society of Automotive Engineers), 1975, pp. 137/144.
Gorille et al.: Bosch Electronic Fuel Injection with Closed Loop Control, E paper 750368, (Society of Automotive Engineers), 1975, pp. 137/144. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706196A (en) * 1984-08-10 1987-11-10 Nippondenso Co., Ltd. Apparatus and method for injecting fuel into engine according to group injection system
US4872117A (en) * 1984-11-30 1989-10-03 Suzuki Jidosha Kogyo Kabushiki Kaisha Apparatus for controlling an air-fuel ratio in an internal combustion engine
US4700675A (en) * 1985-05-31 1987-10-20 Honda Giken Kogyo K.K. Method of controlling fuel supply for internal combustion engine at idle
US5050084A (en) * 1989-02-01 1991-09-17 Japan Electronic Control Systems Co., Ltd. Method and apparatus for controlling supply of fuel into internal combustion engine

Also Published As

Publication number Publication date
JPS56146025A (en) 1981-11-13

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Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA, 1, TOYOTACHO, TOY

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